Well, I've only used the new grinder twice. It's hard to figure they're both from the same company. A couple things stand out. 1, the larger one is a little louder but a little "faster" than the smaller one. Even though burrs are same size and look very similar. They both give a similar quality grind. At least to my tastes with my Moccamaster. If you have a fancy Espresso maker or a large French press not sure what you would think of either since I have neither of those items.
Re, convenience. The larger unit is not so large to make it inconvenient. Size is not obtrusive. Fits easily where you place it. Build quality seems very good with both.
Static control. Not as good with the larger unit. I think this is a function of the more powerful motor (what sounds like faster speed) and quite a bit faster grind from whole bean to grounds. Still FAR better than any grinder I have ever had or used (even the OXO), but not as good as it's little brother.
So, despite the higher capacity, faster throughput, solid build and so on. I think (at least after my initial 2 uses), I liked the first unit the best. It seemed to hit a "sweet spot" for all the things you really want a home grinder to do.
That being said this large one is not a brad grinder. But, jury is out if it will be my new "driver" or if I repurchase the smaller and return this